(a) Mercury (a metal) is a liquid at room temperature' Bromine (a non-metal) is a liquid at room temperature' (b) Sodium (a metal) is very soft. Diamond (a form of carbon) is very hard. (c) Gallium has a very low melting point' Diamond (a non-metal) has a very high melting point.
(a) Mercury (a metal) is a liquid at room temperature’
Bromine (a non-metal) is a liquid at room temperature’
(b) Sodium (a metal) is very soft.
Diamond (a form of carbon) is very hard.
(c) Gallium has a very low melting point’
Diamond (a non-metal) has a very high melting point.
(a) Copper is higher than silver in the activity series of metals. It displaces silver from silver nitrate and forms copper nitrate which gives a bluish green colour in the solution. (b) Cu(s) + 2AgNO₃ (aq) ⟶ Cu(NO₃)₂ (aq) + 2Ag (s)
(a) Copper is higher than silver in the activity series of metals. It displaces silver from silver nitrate and forms copper nitrate which gives a bluish green colour in the solution.
(b) Cu(s) + 2AgNO₃ (aq) ⟶ Cu(NO₃)₂ (aq) + 2Ag (s)
Change in smell and taste of fats and oils containing food due to atmospheric oxidation is called rancidity. Methods to prevent rancidity : (i) Keep such foods in air tight containers' (ii) Flush bags of such foods like chips with an inert gas nitrogen.
Change in smell and taste of fats and oils containing food due to atmospheric oxidation is called rancidity.
Methods to prevent rancidity :
(i) Keep such foods in air tight containers’
(ii) Flush bags of such foods like chips with an inert gas nitrogen.
The cooperatives are also playing an important role in providing food and related items especially in the southern and western parts of the country. The cooperative societies setup shops to sell low price goods to poor people. In Tamil Nadu, around 94 per cent of all fair price shops are being run bRead more
The cooperatives are also playing an important role in providing food and related items especially in the southern and western parts of the country. The cooperative societies setup shops to sell low price goods to poor people. In Tamil Nadu, around 94 per cent of all fair price shops are being run by the cooperatives. In Delhi. Mother Dairy is providing milk and milk products and vegetable, etc. to the consumers at the controlled rate decided by the Government of Delhi. Amul is another example of cooperatives in milk and milk products from Gujarat. It
has brought the White Revolution in the country
The problems of the functioning of ration shops are as follows: (i) Diverting the grains to open market to get better margin. (ii) Selling poor quality grains. (iii) Irregular opening of the shops. (iv) Finding ration shops regularly with unsold stocks of poor quality grains. When ration shops are uRead more
The problems of the functioning of ration shops are as follows:
(i) Diverting the grains to open market to get better margin.
(ii) Selling poor quality grains.
(iii) Irregular opening of the shops.
(iv) Finding ration shops regularly with unsold stocks of poor quality grains. When ration shops are unable to sell, a massive stock of food grains piles up with the FCI.
Write one example of each of the following: (a) A metal and a non-metal which are liquids at room temperature. (b) A metal which is very soft and a non-metal which is very hard. (c) A metal which has very low melting point and a non-metal which has very high melting point.
(a) Mercury (a metal) is a liquid at room temperature' Bromine (a non-metal) is a liquid at room temperature' (b) Sodium (a metal) is very soft. Diamond (a form of carbon) is very hard. (c) Gallium has a very low melting point' Diamond (a non-metal) has a very high melting point.
(a) Mercury (a metal) is a liquid at room temperature’
See lessBromine (a non-metal) is a liquid at room temperature’
(b) Sodium (a metal) is very soft.
Diamond (a form of carbon) is very hard.
(c) Gallium has a very low melting point’
Diamond (a non-metal) has a very high melting point.
When a copper wire is left in silver nitrate solution, it is observed that the solution turns bluish green. (a) Explain the observation. (b) Write the balanced chemical equation to represent the change taking place.
(a) Copper is higher than silver in the activity series of metals. It displaces silver from silver nitrate and forms copper nitrate which gives a bluish green colour in the solution. (b) Cu(s) + 2AgNO₃ (aq) ⟶ Cu(NO₃)₂ (aq) + 2Ag (s)
(a) Copper is higher than silver in the activity series of metals. It displaces silver from silver nitrate and forms copper nitrate which gives a bluish green colour in the solution.
See less(b) Cu(s) + 2AgNO₃ (aq) ⟶ Cu(NO₃)₂ (aq) + 2Ag (s)
Consider the following salts: Na ₂CO₃, NaC1, NH4C1, CH₃COONa. Which of these salts will give (i) acidic solution (ii) neutral solution and (iii) basic solution?
(i) Acidic solution - NH₄C1 (ii) Neutral solution – NaC1 (iii) Basic solution - Na₂CO₃, CH₃COONa
(i) Acidic solution – NH₄C1
See less(ii) Neutral solution – NaC1
(iii) Basic solution – Na₂CO₃, CH₃COONa
Explain the term rancidity. State any two methods to prevent rancidity in fat and oil containing foods.
Change in smell and taste of fats and oils containing food due to atmospheric oxidation is called rancidity. Methods to prevent rancidity : (i) Keep such foods in air tight containers' (ii) Flush bags of such foods like chips with an inert gas nitrogen.
Change in smell and taste of fats and oils containing food due to atmospheric oxidation is called rancidity.
See lessMethods to prevent rancidity :
(i) Keep such foods in air tight containers’
(ii) Flush bags of such foods like chips with an inert gas nitrogen.
Explain the term rancidity. State any two methods to prevent rancidity in fat and oil containing foods.
Change in smell and taste of fats and oils containing food due to atmospheric oxidation is called rancidity.
Change in smell and taste of fats and oils containing food due to atmospheric oxidation is called rancidity.
See lessName any two green house gases.
Carbon dioxide and methane are green house gases.
Carbon dioxide and methane are green house gases.
See lessMention one reason why tungsten is used for making filament of electric lamp.
Tungsten is used for making filament of electric lamp because its melting point is extremely high at 3380 °C.
Tungsten is used for making filament of electric lamp because its melting point is
See lessextremely high at 3380 °C.
When we breathe out, why does the air passage not collapse?
Rings of cartilage present in throat on trachea ensure that air passage does not collapse when we breathe out.
Rings of cartilage present in throat on trachea ensure that air passage does not collapse when we breathe out.
See lessWrite a note on the role of cooperatives in providing food and related items.
The cooperatives are also playing an important role in providing food and related items especially in the southern and western parts of the country. The cooperative societies setup shops to sell low price goods to poor people. In Tamil Nadu, around 94 per cent of all fair price shops are being run bRead more
The cooperatives are also playing an important role in providing food and related items especially in the southern and western parts of the country. The cooperative societies setup shops to sell low price goods to poor people. In Tamil Nadu, around 94 per cent of all fair price shops are being run by the cooperatives. In Delhi. Mother Dairy is providing milk and milk products and vegetable, etc. to the consumers at the controlled rate decided by the Government of Delhi. Amul is another example of cooperatives in milk and milk products from Gujarat. It
See lesshas brought the White Revolution in the country
What are the problems of the functioning of ration shops?
The problems of the functioning of ration shops are as follows: (i) Diverting the grains to open market to get better margin. (ii) Selling poor quality grains. (iii) Irregular opening of the shops. (iv) Finding ration shops regularly with unsold stocks of poor quality grains. When ration shops are uRead more
The problems of the functioning of ration shops are as follows:
See less(i) Diverting the grains to open market to get better margin.
(ii) Selling poor quality grains.
(iii) Irregular opening of the shops.
(iv) Finding ration shops regularly with unsold stocks of poor quality grains. When ration shops are unable to sell, a massive stock of food grains piles up with the FCI.